ISO 11502 Plastics Film and lamination blocking resistance test

Information on the most widely used ASTM standards within the materials testing industry

Descriptions of the most prominent lSO standards within the materials testing industry

Standards including EN, DIN, JlS, and more

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Mechanical testing in the plastic pipe industry determines ring stiffness, impact resistance, and tensile performance, directly preventing pipe bursts and deformation risks. UnitedTest can cover full-dimensional mechanical testing of pipes, complies with ISO,ASTM,EN et.c, international standards, and provides customized testing solutions.

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Mechanical testing in the packaging industry determines the packaging's resistance to compression, impact, and tension, directly ensuring the safety of contents during storage and transportation. UnitedTest can cover comprehensive mechanical testing for packaging, complying with ISO, ASTM Standards, and provides customized testing solutions for compression, drop, tear, and more.

Mechanical testing in the transportation industry concerns the load-bearing and fatigue resistance performance of core components such as vehicles, tracks, and containers, directly ensuring transport safety and equipment durability. UnitedTest can cover mechanical testing for all types of transportation materials, complying with national and international standards, and provides customized testing solutions including tensile, fatigue, and impact tests.

Metallurgical testing examines the properties of metallic materials to determine if a particular metal is appropriate for its intended use.

Testing of polymer materials covers mechanical, thermal, and chemical properties, verifying strength, heat resistance, composition, and ensuring product quality and compliance.

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Testing of rubber and elastomers is used to assess the various properties and performance of materials under different conditions. This is crucial for ensuring the safety, functionality, and quality of rubber and elastomer products used in industries such as automotive, construction, consumer goods, and aerospace.

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Tensile test evaluates material resistance to stretching, measuring strength/elongation critical for quality control. UnitedTest offers universal tensile testers (10-600KN) compliant with ASTM/ISO standards, providing tailored solutions for metals, polymers, medical & industrial materials.

Compression test assesses material resistance to compressive loads, measuring strength/deformation critical for quality validation. UnitedTest offers compression testing machines compliant with ASTM/ISO standards, providing tailored solutions for concrete, plastics, metals and industrial components.

Flexural & Bend tests evaluate material resistance to bending forces, measuring strength, stiffness and ductility for quality assurance. UnitedTest provides flexural testing machines (3-point/4-point bend) compliant with ASTM/ISO standards, offering tailored solutions for composites, plastics, metals and construction materials.

Torsion Test evaluates material resistance to rotational forces, measuring torsional strength/ductility critical for fasteners, insulators, shafts. UnitedTest offers torsion testers compliant with ASTM A938/ISO 16047, providing tailored solutions for automotive, aerospace, fastener industries.

Fatigue Test assesses material durability under cyclic loading, critical for predicting service life of industrial components. UnitedTest offers fatigue testing systems (axial/bending/torsion) compliant with ASTM E466/ISO 12106, providing tailored solutions for automotive, aerospace and manufacturing sectors.

Peel Test measures material adhesion strength by evaluating resistance to peeling forces, critical for adhesives, films, packaging. UnitedTest offers peel testers compliant with ASTM D903/ISO 8510, covering 90°/180° peel tests, and tailored solutions for packaging, automotive, textile industries.

Impact Test evaluates material resistance to sudden shock loads, critical for assessing toughness and fracture risk. UnitedTest offers impact testers (Charpy/Izod/fall weight) compliant with ASTM E23/ISO 148, providing tailored solutions for metals, plastics, glass and industrial components.

Tear & Shear Test evaluates material resistance to tearing and shearing forces, measuring critical strength parameters for quality control. Tear tests (Elmendorf/trouser/trapezoidal) assess resistance to crack propagation in films/fabrics, while shear tests measure resistance to parallel forces in joints/bolts. UnitedTest provides universal testing machines (10KN-600KN) with specialized fixtures for both tests, compliant with ASTM D624/D3164 and ISO standards, serving automotive, packaging and construction industries.

Hardness test measures material's resistance to permanent indentation, critical for quality control. UnitedTest offers universal hardness testers (Rockwell/Brinell/Vickers) compliant with ASTM/ISO standards, plus tailored hardness testing solutions for diverse industrial needs.

Biaxial/triaxial tests evaluate material performance under multi-axis loads, critical for biomaterials, metals and composites. UnitedTest provides compliant testing machines (ASTM/ISO) for planar biaxial, static/fatigue triaxial tests, with tailored solutions for industrial & biomedical needs.

Friction and wear tests assess material resistance to friction, abrasion and wear, critical for industrial material performance validation. UnitedTest offers tribometers compliant with ASTM G99/ISO standards, covering pin-on-disk, four-ball tests, and tailored friction & wear testing solutions for diverse industries.

Pressure test evaluates material/component resistance to static/dynamic pressure, critical for sealing, strength and safety validation. UnitedTest offers pressure testing machines compliant with ASTM/ISO standards, covering burst, hold-pressure tests, and tailored solutions for industrial, automotive & medical sectors.

Fire test assesses material flammability, heat resistance and fire-retardant performance, critical for safety compliance across industries. UnitedTest offers fire testing equipment compliant with ASTM/ISO/UL standards, providing tailored fire test solutions for building materials, plastics and industrial components.

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ISO 11502 Standard | Blocking Resistance Test Machine for Plastic Film & Sheeting | UnitedTest

UnitedTest manufactures ISO 11502 compliant blocking testers for flexible plastic packaging factories and material testing labs worldwide.

ISO 11502 Plastics, Film and Sheeting – Determination of Blocking Resistance assesses blocking resistance, describing how easily stacked flexible plastic films or sheets self-adhere under combined heat and compression loads. The standard specifies two separate test protocols for full performance evaluation: qualitative Method A and quantitative Method B.

Our blocking test equipment supports both ISO 11502 test methods, delivering consistent qualitative judgment and quantitative blocking force data for film formulation R&D and production quality control.

Two Specific Test Methods

Method A: Qualitative Visual Screening Method

A rapid pass/fail assessment to judge whether blocking occurs after accelerated aging, without numerical force data.

After 24 h thermal compression aging at 50 °C / 7 kPa pressure, film pairs are manually peeled. Blocking is confirmed if:

A reference metal weight is lifted during separation; OR

Visible surface damage (transfer, peeling, scuffing) appears on film contact surfaces.

Method B: Quantitative Force Measurement Method

Measures the exact separation force (in Newtons) required to pull apart pre-aged stuck film layers using a universal tensile tester, delivering quantifiable blocking resistance values for performance comparison.

After 3 h accelerated aging at 50 °C / 3 kPa pressure, blocked film pairs are fixed to 100×100 mm aluminum platens on a tensile machine. The machine pulls the platens apart at a constant crosshead speed, recording the maximum tensile force needed to fully separate the two film layers as the quantitative blocking resistance value.

Test Specimen Specifications

Shared Specimen Dimensions

All test strips are cut to 150 mm (length) × 76 mm (width); long side aligns with the film machine direction (MD) for Method B.

Specimen Quantity

Method A: 6 total specimens, assembled into 3 test assemblies (face-face, back-back, back-face contact orientations)

Method B: 10 specimens, assembled into 5 identical test assemblies (uniform surface contact orientation selected by the user)

Required Test Equipment of ISO 11502 Plastics Film and lamination blocking resistance test:

For method B

Constant-speed Universal Testing Machine (UTM),

Pair of matched 100 mm × 100 mm square aluminum platens with rigid UTM adapters

2.3 kg dead weight (creates 3 kPa aging pressure)

Spatula/wide knife for careful specimen transfer

For method A

5.4 kg dead weight (creates 7 kPa uniform pressure)

50 g and 100 g rectangular metal bars (separation weight indicators)

Long-arm metal clip for manual film peeling

Horizontal flat test bench surface

Auxiliary Equipment for A & B

Temperature-controlled oven (50 ±2 °C uniform heating)

100 mm × 76 mm glass plates (~2 mm thickness)

100 mm × 76 mm filter paper strips

Double-sided pressure-sensitive adhesive tape

Standard climate chamber for pre-conditioning per ISO 291.

Key Test Parameters & Mandatory Stipulations:

Parameter	Method A (Qualitative)	Method B (Quantitative)
Oven temperature	50 ±2 °C	50 ±2 °C
Compressive pressure	7 kPa (5.4 kg weight)	3 kPa (2.3 kg weight)
Aging duration	24 hours	3 hours
Post-aging recovery time	2–24 h at standard atmosphere	2–24 h at standard atmosphere
Method A manual peeling speed: 25 ±2.5 mm/s uniform manual pull rate Method B UTM crosshead speed: 5 mm/min constant separation speed. Surface Contact Configurations: Three standard contact combinations for printed films: face-to-face, back-to-back, back-to-face; all orientations must be tested for complete qualitative evaluation.

Step by step Test Procedure of ISO 11502 Plastics Film and lamination blocking resistance test

Procedure A (Qualitative Method)

Condition specimens, glass plates and filter paper for 24 h per ISO 291.

Build three separate stacked assemblies with alternating glass plate, filter paper, two film specimens, filter paper, glass plate; each assembly uses one unique surface contact pairing. Leave 50 mm film overhang for easy peeling.

Load each assembly with 5.4 kg weight, place in 50 °C oven for 24 h aging.

Remove weights, cool assemblies for 2–24 h at standard atmosphere.

Separate film pairs, mount 50 g bar under unprinted films or 100 g bar under printed films.

Manually pull upper film at 25 mm/s; record if the metal bar lifts and check for surface damage.

Record blocking occurrence and surface defects for the test report.

Procedure B (Quantitative Method)

Pre-condition all test materials for 24 h under ISO 291 standard atmosphere.

Prepare five identical aging assemblies with glass plates, filter paper and paired film specimens; apply uniform surface contact orientation across all sets.

Load each assembly with 2.3 kg weight, heat at 50 °C for 3 hours.

Remove weights, cool assemblies for 2–24 h at standard conditions.

Transfer one blocked film pair symmetrically onto the lower aluminum platen of the UTM.

Lower the upper platen to rest flat on the film; peel back overhanging film edges with a knife.

Secure upper film ends to top platen and lower film ends to bottom platen with double-sided tape.

Set UTM crosshead speed to 5 mm/min, start test and record maximum separation force.

Repeat for all five assemblies, calculate average peak force as final blocking resistance.

Industrial Application Fields

ISO 11502 is a global standard widely adopted across international plastic film manufacturing and converting sectors:

Flexible food packaging: BOPP, PE, PET, CPP wrapping films, stretch/shrink wrap, laminated barrier films

Printing & coating industry: Printed decorative films, metallized packaging films, ink-coated substrates

Agricultural plastics: Greenhouse mulch film, crop silage wrap, large rolled agricultural sheeting

Medical packaging: Sterile flexible barrier films, disposable medical packaging rolls

Industrial protective films: Surface release films, optical plastic sheets, roll stock protective coverings

Consumer goods films: Household cling wrap, plastic bag stock, decorative printed films

Typical use cases: incoming raw material QC, anti-blocking slip agent formulation R&D, cross-border supplier quality acceptance, product shelf-life aging simulation, and comparative performance testing of different film grades.

Related Test Standard:

ASTM D3354	Standard Test Method for Blocking Load of Plastic Film by the Parallel Plate Method
ISO 11502	Plastics - Film and lamination - Determination of blocking resistance
GB/T 39935	Plastics—Film and sheeting—Determination of blocking resistance

ISO 11502 vs ASTM D3354 — At a Glance

Feature	ISO 11502 (Method B)	ASTM D3354
Approach	Induces blocking (oven, 50°C, pressure)	Tests already blockedas-cut specimen
Induction	3 kPa, 3 h, 50 °C	None
Contact area	100×100 mm (implied by block size)	100 cm² (explicit)
Speed	5 mm/min crosshead	5.1 mm/min (Proc B) or 90 g/min (Proc A)
Unit	N	g (max 200 g)
Precision	Not known (no interlab data yet per 5.5)	Known (Table 1, 6-lab round robin)
Qualitative option	✅ Method A	❌
Printed film oriented	✅ Explicit face/back	Not explicit

Keywords: UnitedTest ISO 11502 blocking resistance tester, ISO 11502 plastic film blocking test machine, flexible sheeting heat-pressure sticking testing equipment, ISO 11502 qualitative Method A quantitative Method B blocking tester, stacked plastic sheet adhesion resistance inspection bench

WDW Series Computer Control Electronic Universal Testing Machine made by UNITEDTEST range from 100N to 600KN load capacity with various models like single columns, table type, door frame type etc., is used to perform tension, compression, flexure/bending, shearing, peeling etc., test for metal and nonmetal specimens.

UnitedTest nickel-plated two-square-platen bonding strength test fixture adopts separated upper and lower flat platens, applying uniform tensile/shear load to test adhesive bonding performance. Complete standard specifications, customizable platen sizes, meets ASTM, ISO standard.

Thin Plastic Film Tensile Testing Fixture is specially designed for tensile strength testing of flexible and soft plastic film specimens. Fully compliant with the ASTM D882 standard for thin film tensile testing, the fixture features premium rubber-coated jaws.

Electricity hot blast drying oven is mainly used to measure the dimension change of plastic material after heating, suitable for plastic pipe, plastic sheet etc.

Q1: What is blocking as defined in ISO 11502, and what two test methods does this standard provide?

A: Blocking means unintended adhesion between two plastic film or sheet surfaces when they are tightly stacked. ISO 11502:2018 includes two independent test methods:

Method A: Qualitative screening method for simple pass/fail judgment of blocking severity without numerical force data.

Method B: Quantitative tensile method that measures the exact separation force (in Newtons) required to pull apart adhered film layers.

Q2: What is the core difference between ISO 11502 Method A and Method B?

A: Purpose: Method A is a fast qualitative check; Method B generates quantitative force values for performance comparison.

Aging parameters: Method A uses 7 kPa pressure for 24 h aging; Method B uses milder 3 kPa pressure for only 3 h aging.

Testing operation: Method A relies on manual peeling with reference metal bars to judge blocking; Method B uses a universal tensile tester to record maximum separation force.

Specimen quantity: Method A needs 6 specimens (3 assemblies of different surface contact pairs); Method B needs 10 specimens (5 identical assemblies for averaging).

Output result: Method A records only visual blocking phenomenon and surface damage; Method B outputs average peak separation force in Newtons.

Q3: Why is ISO 11502 different from ASTM D3354 even though both test film blocking? Can test results be interchanged?

A: They are similar but technically non-equivalent, so results cannot be directly compared or converted:

Pre-blocking aging: ISO 11502 artificially creates blocking via controlled heat + pressure aging; ASTM D3354 tests existing natural blocking without pre-aging treatment.

Specimen size, contact area, pressure and aging time are completely different.

Units: ISO 11502 Method B uses Newtons; ASTM D3354 uses grams.

ASTM D3354 has a maximum test load limit of 200 g, while ISO 11502 has no upper force limit.

ISO provides both qualitative and quantitative options; ASTM D3354 only has two quantitative tensile procedures.

Q4: What size are ISO 11502 test specimens, and what sampling rules must be followed?

A: Specimen dimension: 150 mm × 76 mm strips; long side aligns with film machine direction for Method B.

Sampling requirements: Cut samples at least 100 mm away from roll edges and over 1 m from the start/end of the film roll.

Resting rule: Films must sit for a minimum of 16 h after manufacturing before testing.

Printed films: Collect specimens covering all print colour combinations to test all possible contact surface pairs.

Q5: When does ISO 11502 confirm that blocking has occurred in Method A (qualitative test)?

A: Blocking is confirmed if either condition happens during manual separation:

The reference metal bar (50 g for unprinted film, 100 g for printed film) is lifted off the flat horizontal surface when peeling the film layers;

Visible surface damage, ink transfer, scuffing or material tearing appears on the contact sides of the film.

Q6: Why is ISO 11502 an important standard for plastic film manufacturers and global converters?

A: Simulates real storage conditions: Accelerated heat-pressure aging replicates long-term stacked roll storage and transport environments to predict blocking failures in advance.

Dual testing options for different QC needs: Fast low-cost qualitative screening for daily batch inspection; quantitative force data for formulation R&D and supplier qualification.

Global unified standard: As an ISO international standard, it harmonizes test methods across all countries, reducing trade disputes for cross-border film supply chains.

Guides anti-blocking formulation development: Quantitative force data helps optimize slip agents, anti-block masterbatches and extrusion processes to reduce adhesion without sacrificing other film properties.

Prevents costly production downtime: Severe blocking causes film tearing, unwinding jams and waste on printing, lamination and packaging machines; test results filter unqualified film batches before processing.

Complete evaluation for printed films: Special requirements for multi-colour printed specimens avoid overlooking ink-induced blocking or surface transfer defects.

Q7: How many replicate assemblies are required for Method B quantitative testing, and how is the final result calculated?

A: Five separate aging assemblies are prepared and tested individually. The maximum separation force (Newtons) of each replicate is recorded, and the average value of the five results is taken as the final blocking resistance of the material.

Q8: Why do we need a 2–24 h recovery period after oven aging before testing separation?

A: This cooling recovery step stabilizes the film’s temperature and internal stress after high-temperature aging, eliminating thermal expansion interference and ensuring consistent, repeatable separation force results.

Q9: What tools are used to judge blocking severity in Method A qualitative testing?

A: Two standard rectangular metal bars: 50 g for unprinted smooth film surfaces and 100 g for printed or ink-coated film surfaces. If the film’s adhesion can lift the bar, blocking is deemed significant.

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